| A | B |
|---|
| Sound waves travel the slowest through | gases |
| The highness or lowness of sound is called | pitch |
| Sound travels from its source in | waves |
| The speed at which sound travels through different states of matter depends on | how closely the object’s molecules are packed together |
| Sound is a form of energy which is always produced by | vibrating matter |
| heard when sound reflects off of a surface | echo |
| The number of vibrations in a given unit of time | the frequency of sound |
| The rapid back-and-forth motion of matter resulting in a sound wave | vibration |
| sound can't travel through a | vacuum |
| used to detect sounds and locate underwater objects | sonar |
| increases as a submarine dives deeper into the ocean | water pressure |
| crest to trough | wave length |
